Useful Information:
Stern Lighting - All you ever need to know about headlamps, including some how-tos.
Ford Probe FAQ - A great "starter" page about Probes, but a bit under-updated lately.

Personal Pages:Julian Bradbury - The best Probe maintenance page around. Repairs, preventative care, maintenance.
William Chenoweth - aka Ntruder. Posted the highest numbers for a naturally aspirated PGT with his fairly unique setup. Partner-in-crime with Dan on the Turbo project.
Dan Dunhem - WAS NOS powered, but soon to be turbocharged. William's partner-in-crime. One of the most killer sound systems. Also one of the most powerful normally aspirate GTs.
Justin Fuller - One of the most complete parts listings around.
Jason Hunziker - A very well designed and frequently updated page I've jacked artwork from in the past. Sorry, Jay. :)
Ross Lapkoff - NOS powered. One of the best pages, bar none. Car mod how-tos, dyno runs, racing tips, club information, etc.